<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<style>
			.box{
				border:10px solid black;
			}
			.sbox{
				height:150px;
			}
			.sbox1{
				background:red;
				float:left;
			}
			.sbox2{
				background:green;
				float:left;
			}
			.sbox3{
				background:blue;
				float:left;
			}
		</style>
	</head>
	<body>
		<div class="box">
			<div class="sbox sbox1">1</div>
			<div class="sbox sbox2">2</div>
			<div class="sbox sbox3">3</div>
		</div>
	</body>
</html>
